JP2001277438A - Plastic film easy of adhesion and its production method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic film easy of adhesion which is adhered tightly to a top coat layer of vapor-deposited metal, printing ink, a gas-barrier resin, etc., and applicable to packaging materials and industrial materials. SOLUTION: In the plastic film, at least on one side of a base material film, an adhesive layer easy of adhesion comprising (A) a water soluble or water dispersible resin, (B) a substantially water insoluble amino resin, and (C) a water dispersing auxiliary is formed. The mass ratio of the component (A) to the component (B) is 98/2-70/30, and that of the component (B) to the component (C) is 80/20-50/50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an easily adhesive plastic film and a method for producing the same. More specifically, the present invention relates to an easily-adhesive plastic film having excellent adhesiveness to a top coat layer such as a vapor-deposited metal, a printing ink, and a gas barrier resin, and provided to packaging materials and industrial materials, and a method for producing the same.

[0002]

2. Description of the Related Art Polyester films have mechanical properties,
It has excellent heat resistance and transparency and is widely used as a film for industrial applications and food packaging. However, the polyester film alone lacks so-called gas barrier properties such as oxygen and water vapor barrier properties, which are one of the very important properties for food packaging materials. Therefore, the film surface is coated with a metal or metal oxide such as aluminum or a metal oxide or a gas barrier resin on the film surface, thereby improving the gas barrier property by forming a so-called gas barrier layer and further improving the food preservability. ing. In general, the surface of a food packaging film is subjected to printing processing. When used as a food packaging material, the interlayer adhesion between the base film and the top coat layer is extremely important.

[0003] Polyester films have excellent properties, but their surfaces are highly oriented and crystallized, have high surface cohesion, and generally have low adhesion. Therefore, the surface is modified by a physical treatment method such as corona discharge treatment or plasma treatment, or a chemical treatment method that activates the film surface by using chemicals such as acids and alkalis. Attempts have been made to increase sex. However, in such a physical method, the steps are simple but the obtained adhesiveness is insufficient. In the case of the chemical method, the steps are complicated and there is a problem such as deterioration of the working environment.

[0004] Apart from the above physical and chemical treatment methods,
Apply a primer having adhesive activity to the base film,
There is a method of laminating an easy-adhesion layer (hereinafter, referred to as a primer layer), and this method is widely used because a primer component can be selected according to various types of top coat layers coated on the primary layer.

As a constituent of the primer layer, an aqueous resin is widely used from the viewpoints of workability, safety and cost. However, polyurethane resin, polyester resin and acrylic resin are particularly useful for improving adhesion to a metal deposited, printing ink and the like. Resins and the like are preferably used.

In addition, it has been practiced to blend various curing agents into the above-mentioned aqueous resin to improve the performance as a primer layer, particularly water resistance and heat resistance. Curing agents used for this purpose include, for example, isocyanate compounds, melamine compounds and epoxy compounds. For example, JP-B-56-151562 and JP-B-61-10311 describe a method for obtaining an easily adhesive film using an isocyanate compound. JP-A-8-31221 discloses that a primer layer composed of a polyester resin and a melamine compound improves the water-resistant adhesion of a vapor-deposited layer. JP-A-8-332706 describes a method for obtaining an easily-adhesive laminated film using a carbodiimide monomer having one carbodiimide group per molecule.

[0007] However, the primer layer using these existing techniques, especially when subjected to high-temperature hot water treatment such as boiling and retorting, has a reduced interlayer adhesion between the base film and the top coat layer, and is not suitable for food packaging. There was a problem in practical performance as a material. In other words, various curing agents and cross-linking agents used as aqueous primer coating agents are inferior in hot water adhesion due to high hydrophilicity, and may also be eluted, in view of the recent strict quality standards for food packaging materials, Often the demands cannot be met.

Further, a method is known in which a hydrophilic organic solvent having a low boiling point is added to an aqueous solution or dispersion of a resin to improve the solubility or dispersibility of the resin and is applied to a plastic film or the like to improve the film performance. Is widely practiced. By using a resin having a relatively high hydrophobicity by applying this method, a certain result can be obtained in improving the hot water resistance of the primer coating agent described above. However, when an organic solvent-based coating agent is used, vapors of the organic solvent are generated during the coating film drying process, which contaminates the surroundings and significantly impairs the working environment. Is required, and the advantage of the water-based coating agent is not fully utilized.

By adding a substantially water-insoluble amino resin to an aqueous resin such as a polyurethane or polyester resin as a primer layer, an easily adhesive plastic film excellent in heat resistance and water resistance can be obtained. Has a problem that it is difficult to prepare a stable resin aqueous solution or aqueous dispersion because it is insoluble in water.

[0010]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and has excellent adhesion to a top coat layer such as a printing ink, a vapor-deposited metal and a gas barrier resin,
Another object of the present invention is to provide an easily-adhesive plastic film having excellent adhesion to a base film even after high-temperature hot water treatment such as boiling and retorting, and a method for producing the same.

[0011]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that a specific primer layer has excellent easy adhesion to various top coat layers, and have reached the present invention.

That is, the present invention provides (A) a water-soluble or water-dispersible resin on at least one side of a substrate film;
An easy-adhesion layer comprising (B) a substantially water-insoluble amino resin and (C) a water-dispersing aid is formed, and the constituent ratios of the components forming the easy-adhesion layer are component (A) and component (B). Mass ratio of 9
8/2 to 70/30, and the mass ratio of the component (B) to the component (C) is 80/20 to 50/50. .

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
As the water-soluble or water-dispersible resin applied to the configuration of the primer layer in the present invention, a urethane resin or a polyester resin is preferable.

Examples of the water-soluble or water-dispersible polyurethane resin applied to the constitution of the primer layer in the present invention include various polyurethane resins, polyurethane polyurea resins and prepolymers thereof. Specific examples of such a urethane resin include tolylene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate,
Diisocyanate components such as cyclohexane diisocyanate, isophorone diisocyanate and dicyclohexyl diisocyanate, and ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, cyclohexanedimethanol, bisphenol, polyester diol, and polyether diol Reactants with diol components such as polycarbonate diols and polyethylene glycols, and reactants with urethane prepolymers having terminal isocyanate groups and amino compounds, aminosulfonates, polyhydroxycarboxylic acids, bisulfite and the like. Can be.

[0015] Examples of the water-soluble or water-dispersible polyester resin include various polyester resins and modified products thereof. Specific examples of such polyester resins include terephthalic acid, phthalic acid, isophthalic acid, trimellitic acid, pyromellitic acid, 2-sulfoisophthalic acid, 5-sulfoisophthalic acid, adipic acid, sebacic acid, succinic acid, dodecane Polycarboxylic acid components such as diacid, ethylene glycol, propylene glycol,
1,4-butanediol, 1,6-hexanediol,
Examples include a reaction product with a diol component such as neopentyl glycol, cyclohexane dimethanol, and bisphenol, and also include a modified product with an acrylic resin, an epoxy resin, or the like.

It is necessary to use a substantially water-insoluble amino resin for the primer layer in the present invention. The amino resin has a basic skeleton structure of formaldehyde and an alcohol adduct of an amino-containing compound such as urea, melamine, acetoguanamine, benzoguanamine, and glycoluril, and these are condensed to polymerize into a number to several tens of units. It is a general term for resins having a structure. Specific examples of the substantially water-insoluble amino resin include the following compounds. That is, (A) an amino resin having at least one of acetoguanamine, benzoguanamine, and glycoluril in which at least 70 mol% of the total skeleton structure is provided;
(A) 30 to 70 mol% of the whole skeleton structure is urea and / or melamine, and has an average of 1.5 or more alkyl ether groups per skeleton structure, and 50 mol% or less of the amino group is a methyl ether group. Urea and / or melamine at least 70 mol% of the resin, (c) the total skeleton structure;
An amino resin having an average of 1.5 or more alkyl ether groups per skeleton structure, of which 30 mol% or less is a methyl ether group, and the like can be given. A water-insoluble amino resin is a resin which does not inherently stably disperse or dissolve itself in water, but has a solubility of less than 3 g in 100 g of water at 20 to 60 ° C., and preferably does not reach 1 g. It is. By applying a water-insoluble amino resin to the present invention, a decrease in adhesiveness after hot water treatment unlike the case where various hydrophilic curing agents are used is not recognized.

In the primer layer of the present invention, the composition ratio of the water-soluble or water-dispersible resin (A) and the water-insoluble amino resin (B) needs to be A / B = 98/2 to 70/30 (mass ratio). And preferably 95/5 to 80/2
0. When the content is within this range, water dispersibility can be ensured, the adhesiveness between the base film and the top coat layer is excellent, and excellent hot water resistance can be exhibited. When the mixing ratio of the water-insoluble amino resin (B) to the water-soluble or water-dispersible resin (A) is lower than 2% by mass, the hot water-resistant adhesiveness cannot be obtained. No significant improvement is observed in the adhesiveness, but rather the water dispersibility is reduced and the excess resin is phase-separated in the liquid as an insoluble component.

The easily adhesive film in the present invention comprises:
An aqueous solution is prepared by blending (A), (B) and an aqueous dispersing aid (C), and this is produced by coating this on the surface of a film. Examples of the water dispersing aid (C) include acetylene glycol-based compounds and polyethylene oxide adducts thereof. The acetylene glycol compound and its polyethylene oxide adduct are represented by the general formula (1)

Embedded image (R ₁ , R ₂ : a methyl group, a propyl group or an isopropyl group, R ₃ , R ₄ : a hydroxy group or a polyethylene oxide group) and a compound having a basic structure of acetylene glycol. Specifically, 3,6-dimethyl-4-decyne-3,6-diol, 2,4,7,9-tetramethyl-5-decyne-diol, 2,4,7,9-tetramethyl-5-diol Desin-diol-dipolyoxyethylene ether can be used. In order to ensure the solubility in water and balance the property of the water-insoluble amino resin as a water-dispersing aid which is the object of the present invention, an ethylene oxide adduct Is preferred, and the content of the ethylene oxide moiety is 2
It is 0 to 85% by mass, and more preferably 40 to 65% by mass. The acetylene glycol-based compound is a compound having extremely unique properties, and has a double-sided effect as a surfactant and an antifoaming agent. Despite being a non-ionic compound, it has a high electron density at the center of the molecule and maintains strong polarity.It exhibits strong wettability improvement and defoaming effects, and enhances water dispersibility of hydrophobic resin. At the same time
Suppression of foaming, which is always a problem in an aqueous solution or an aqueous dispersion, can be realized. In addition, low viscosity and high solubility of various organic compounds including amino resin are essential for ensuring compatibility between the water-insoluble amino resin and the aqueous resin and realizing a stable compounding process aimed at by the present invention. . The boiling point of the acetylene glycol compound is
220 ° C. or higher under normal pressure is preferred. The reason for this is that, for example, when the easy-adhesion layer in the present invention is applied to a polyester film using an in-line coating method, heat treatment is performed at a temperature of about 220 ° C. after the formation of the primer layer. This is because the compound volatilizes from the primer layer and contaminates the working environment, which is not preferable in explosion-proof measures. In addition, the compound has a relatively low affinity for water itself, and does not lower the water resistance of the primer layer unlike a general water-dispersing aid even if the film remains as a primer constituent.

In the present invention, when preparing an aqueous solution or aqueous dispersion for coating a base film, the necessary mixing amounts of the water-insoluble amino resin (B) and the aqueous dispersion aid (C) are all mixed in advance, Subsequently, the mixed solution is preferably mixed with a concentrated solution of the water-soluble or water-dispersible resin (A), and finally diluted with water to a predetermined solid content concentration. When the component (B) is directly charged into the solution of the component (A) and mixed, it is insoluble in water and becomes a fat-like mass, phase-separates, and insolubles and sediments of the amino resin are unavoidable and extremely insoluble. It becomes a uniform liquid mixture. By pre-mixing the water-insoluble amino resin (B), which generally has high viscosity and its handling (handling properties) is complicated, and the low-viscosity aqueous dispersion aid (C), the resulting mixture has a relatively high viscosity. Since it is low in fluidity and easy to handle, it can be easily and uniformly mixed with the component (A). Therefore, the above-mentioned component (B) does not clump and separate into phases in the blended liquid. As a result, mixing of the amino resin with a water-soluble or water-dispersible resin which is otherwise difficult to be compatible with each other is not possible. Can be achieved. The component (C) which plays a role as a dispersion medium of the component (B) is instantaneously activated at the component (A) constituent resin / component (B) constituent resin interface when introduced into the component (A) solution. To further increase the compatibility between the resins and exert a great effect in ensuring the dispersion stability of the component (B).

In the primer layer constituting the present invention,
The composition ratio of the water-insoluble amino resin (B) and the water dispersing aid (C) needs to be B / C = 80/20 to 50/50 (mass ratio), preferably 70/30 to 60/40. is there. By adjusting to this range, the compatibility between the water-insoluble amino resin (B) and the water-soluble or water-dispersible resin (A) can be improved. Furthermore, the defoaming property of the aqueous dispersion aid (C) can also exert the effect of suppressing foaming, which generally becomes a major obstacle in aqueous resin coating. If the compounding ratio of the water dispersing aid (C) to the water-insoluble amino resin (B) is lower than 20% by mass, the viscosity reducing effect on the amino resin is reduced, the handling property is deteriorated, and the defoaming property is deteriorated. The wettability of the aqueous solution or dispersion to the film is reduced. Further, even if the compounding ratio is more than 50% by mass, there is no significant change in the effect of addition including the improvement of wettability, and the mixing of the compound with the aqueous solution or the aqueous dispersion becomes non-uniform. The appearance of the coating film is impaired, for example, causing the occurrence of coating unevenness.

In the present invention, by adding a surfactant to the aqueous solution or the aqueous dispersion forming the primer layer, a synergistic effect with the water dispersing aid (C) in terms of defoaming property and improvement of wettability is obtained. Expected and preferred. Anionic
Various nonionic and zwitterionic surfactants can be used, but nonionic surfactants are preferred because they have relatively few problems such as compatibility with the aqueous dispersion aid (C) and foaming.
The effect is exhibited at an addition amount of 0.01 to 0.1% based on the total amount of the aqueous dispersion.

In the present invention, the concentration of the aqueous solution or the aqueous dispersion of the primer layer applied to the base film is 1 to 3.
The content is suitably 30% by mass, and 3 to 10% by mass is more preferable from the viewpoint of coatability to a film and workability.

Further, various additives such as an antistatic agent, an antioxidant, a lubricant and the like may be added to the aqueous solution or the aqueous dispersion and the base film, as long as the effects of the present invention are not impaired. Is also possible.

The base film for forming the easily-adhesive primer layer in the present invention is not particularly limited, but excellent effects can be obtained particularly when applied to a polyester film. Polyester film refers to polyethylene terephthalate, polybutylene terephthalate, polyethylene 2,6
-Naphthalate and the like can be exemplified, and a polyethylene terephthalate film (PET film) is particularly preferable. It is excellent in mechanical properties, heat resistance and transparency, and is a suitable food packaging material.

In the present invention, the aqueous solution or aqueous dispersion of the primer layer may be coated on a substrate film, for example, by coating the aqueous solution or aqueous dispersion on the substrate film before the completion of biaxial orientation crystallization, ie, an unstretched or uniaxially stretched film. It can be applied to a so-called in-line precoating method in which a liquid is applied and a biaxially stretched film is obtained through a stretching heat treatment. The in-line pre-coating method involves applying the aqueous solution or the aqueous dispersion to an unstretched or uniaxially stretched film and then performing a stretching heat treatment.Thus, the primer layer can be thinner than the post-coating method. Adhesion with the coat layer can be improved. In addition, since the step of applying the primer is incorporated in the step of producing the base film, the production of the primer-coated film can be performed at low cost. Regarding the method for stretching the base film, a tenter-type simultaneous biaxial stretching method or a sequential biaxial stretching method can be applied depending on the material.

In the present invention, the primer layer formed by applying an aqueous solution or an aqueous dispersion and heat-treating it has a thickness of 0.01
０．５0.5 μm is preferred. When the thickness is less than 0.01 μm, the adhesiveness is reduced, and when the thickness is more than 0.5 μm, no significant change is observed in the improvement of the easy adhesion. Rather, brushing or blocking occurs on the film roll, and show-through of the primer layer and film roll-off occur. There are adverse effects such as breakage of the primer layer at the time of dispensing and further cutting of the film, which is disadvantageous in terms of cost. As the method for applying the aqueous dispersion, any known method can be selected. For example, a bar coating method, an air knife coating method, a reverse roll coating method, and a gravure roll coating method can be applied.

The easily adhesive plastic film provided by the present invention is provided with various properties by subjecting the surface thereof to a surface activation treatment such as a corona treatment, or by performing printing, various functional coatings, and lamination. It is also possible to further improve its use value.

[0028]

EXAMPLES Next, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples. In addition, the raw materials and evaluation methods used in Examples and Comparative Examples are as follows.

1. Raw material Aqueous polyurethane resin (PU): Hydran AP40 manufactured by Dainippon Ink and Chemicals, Inc. Aqueous polyurethane polyurea resin (PU-PU): Takerac AW605 manufactured by Takeda Pharmaceutical Company Aqueous polyester resin (PEs): Pesresin A215G manufactured by Takamatsu Yushi Co., Ltd. Water-insoluble Amino resin (AR-1): Cymel 303 manufactured by Mitsui Cytec Co., Ltd. Water-insoluble amino resin (AR-2): Cymel 1170 acetylene glycol-based compound (AG-1) manufactured by Mitsui Cytec Co., Ltd .: Olfine E1004 acetylene glycol manufactured by Nissin Chemical Industry Co., Ltd. -Based compound (AG-2): Olfine E1010 methylol melamine compound manufactured by Nissin Chemical Co., Ltd .: Sumimar M50W isocyanate compound manufactured by Sumitomo Chemical Co., Ltd .: Takenate AW725 epoxy compound manufactured by Takeda Pharmaceutical Co., Ltd. Epoxy compound: manufactured by Takamatsu Yushi Co., Ltd. CAT-2N-206

2. Evaluation method (1) Water dispersibility of amino resin Immediately after the completion of blending, the appearance of the blended liquid was visually observed, and the presence or absence of insolubles was determined according to the following criteria. ：: Neither suspended matter on the liquid surface nor sediment on the bottom of the container could be confirmed. △: Either suspended matter or sediment occurred ×: Both suspended matter and sediment occurred

(2) Foamability 200 ml of the sample solution was placed in a 500 ml graduated flask,
Using a stirrer (TK homomixer, manufactured by Tokushu Kika Kogyo Co., Ltd.), the mixture was stirred at 700 rpm for 5 minutes, allowed to stand for 10 minutes, and then the amount of bubbles remaining on the liquid surface was measured on a scale (unit: ml). ). The smaller the amount of foam, the lower the foamability, indicating that the film coating property is excellent.

(3) Adhesion of printing ink Polyurethane ink (NEWLP super R630 white / R162, manufactured by Toyo Ink Mfg. Co., Ltd.)
Red), and heat-treated at 80 ° C. for about 10 seconds. Next, a polyurethane adhesive (Dick Dry Co., Ltd., manufactured by Dainippon Ink and Chemicals, Inc.) was applied to the ink surface of the film.
LX747A / KX75) was applied at about 3 μm and heat-treated at 80 ° C., and then an unstretched polypropylene film (ZK-93K, 60 μm thick, manufactured by Toray Synthetic Film Co., Ltd.) was dry-laminated on a metal roll heated to 90 ° C. at a nip pressure of 490 kPa. Thus, a laminate film was obtained. next,
The laminate strength before and after the retort treatment was measured.

(4) Adhesion of vapor-deposited metal Using a resistance heating vacuum vapor deposition machine, aluminum metal was vapor-deposited at a degree of vacuum of 0.01 Pa on the primer-coated surface of the easily adhesive film to a thickness of 400 to 600 °. Thus, a metal aluminum vapor-deposited film was obtained. Next, a polyurethane adhesive (Dick Dry LX75A / KW40 manufactured by Dainippon Ink and Chemicals, Inc.) was applied to the film deposition surface for about 3 hours.
μm, and heat-treated at 80 ° C., and then a low-density polyethylene film (TUX-FCS manufactured by Tocelo Co.,
m) was dry-laminated on a metal roll heated to 80 ° C. at a nip pressure of 490 kPa to obtain a laminated film. Next, the laminate strength before and after the boil treatment was measured.

(5) Adhesiveness of polyvinylidene chloride copolymer resin Polyvinylidene chloride copolymer (hereinafter referred to as PVDC) whose concentration is adjusted to a dry thickness of 1.5 μm on the primer-coated surface of the easily adhesive film. After coating the latex by the gravure coating method, it was heat-treated at 110 ° C. for 10 seconds to obtain a PVDC coated film. The obtained PVDC coated film was dry-laminated on the PVDC surface using the same method as the above-mentioned vapor-deposited film to obtain a laminated film. Next, the laminate strength before and after the boil treatment was measured.

(6) Lamination strength measurement A laminate film test piece having a width of 15 mm was collected,
℃, 65% RH atmosphere tensile tester (manufactured by Shimadzu Corporation)
Using AGS-100B type), peel strength was measured by peeling the film interface from the end of the test piece while constantly moistening the peel interface with water at a tensile speed of 300 mm / min by the T-peel method. did. Lamination strength measurement was performed on a test piece subjected to hot water treatment and a test piece not subjected to hot water treatment (no treatment). The adhesion was evaluated as good if the lamination strength was 0.8 N / cm or more, which is said to be a performance that can withstand practical use as a food packaging base film.

(7) Hot water treatment conditions The hot water treatment conditions for the test piece were 12 for the printed film.
The retort treatment is performed in hot water at 0 ° C for 30 minutes.
Boil treatment in 5 ° C hot water for 30 minutes.

Example 1 To 20 parts by mass of a water-insoluble amino resin (AR-1) was added 5 parts by mass of an acetylene glycol compound (AG-1), followed by stirring for 10 minutes to obtain a mixed solution. Next, the mixture was added to 80 parts by mass of an aqueous polyurethane resin (PU), stirred for 30 minutes, and then diluted with water to give a total solid content of 5% by mass.
And the mixture was stirred for another 20 minutes to obtain an aqueous resin blended liquid. As compared with a single water-insoluble amino resin having a high viscosity, the mixture was rich in fluidity and excellent in handling properties, and the mixing operation with the aqueous polyurethane resin could be carried out smoothly without any problem. Table 1 shows the results of the evaluation of the foaming property and the presence or absence of agglomerates of the aqueous resin composition liquid according to the above procedure. Next, a relative viscosity of 1.3
8 (20 ° C., phenol / tetrachloroethane = 50 /
50, 0.5 g / dl) PET was melt-extruded from a T-die at 280 ° C.
C. and rapidly cooled by contacting with a rotating drum to obtain an unstretched PET film having a thickness of 210 μm. Subsequently, the unstretched film was stretched 3.8 times in the longitudinal direction on a metal roll heated to 90 to 120 ° C. to obtain a uniaxially stretched PET film. The thickness of the aqueous resin composition after drying and stretching is 0.
After coating the above uniaxially stretched film by a bar coating method so as to have a thickness of 05 μm, the film was dried at 50 to 60 ° C., and then stretched 4.6 times at 120 ° C. in the width direction by a tenter type transverse stretching machine.
Heat treatment at 220 ° C for 10 seconds, cool and wind, thickness 12
A μm primer-coated film was obtained. Table 1 shows the results obtained by subjecting the primer coat film to the top coat processing of printing ink, vapor-deposited metal, and PVDC resin, and measuring the lamination strength.

Examples 2 to 17 An aqueous resin compounding liquid and a primer coat film were obtained in the same procedure as in Example 1 except that the resin components and the mixing ratio were changed as shown in Table 1. Table 1 shows the results of the evaluation of the aqueous resin compounding liquid and the results of measuring the lamination strength of the film.

[0039]

[Table 1]

Comparative Example 1 4 parts by mass of an acetylene glycol compound (AG-1) was added to 96 parts by mass of an aqueous polyurethane resin (PU), and the mixture was stirred for 10 minutes, and water was added so that the total solid concentration became 5% by mass. , And the mixture was further stirred for 20 minutes to obtain an aqueous resin blended liquid. Table 2 shows the results of evaluating the foamability of the aqueous resin composition and the presence or absence of aggregates. Next, the aqueous resin composition was applied to a PET film, dried, stretched, and heat-treated in the same manner as in Example 1 to obtain a primer-coated film. Table 2 shows the results of applying a top coat to each of the printing ink, the vapor-deposited metal, and the PVDC resin on the film, and measuring the lamination strength.

Comparative Example 2 The aqueous polyurethane resin was replaced with an aqueous polyester resin (PE
An aqueous resin compounding liquid and a primer-coated film were obtained in the same procedure as in Comparative Example 1 except that the procedure was changed to s). Table 2 shows the results of the evaluation of the aqueous resin compounding liquid and the results of measuring the lamination strength of the film.

Comparative Example 3 20 parts by mass of a hydrophobic amino resin (AR-1) was directly added to 80 parts by mass of an aqueous polyurethane resin (PU) to the mixed solution. And difficulties. After stirring for 20 minutes, dilute with water and adjust the concentration so that the total solid concentration is 5% by mass.
The mixture was further stirred for 20 minutes to obtain an aqueous resin compounded liquid. Table 2 shows the results of the evaluation of the foaming property and the presence or absence of agglomerates of the aqueous resin composition liquid according to the above procedure. Next, Example 1
In the same manner as described above, the aqueous resin composition was applied to a PET film, dried, stretched, and heat-treated to obtain a primer-coated film. According to the above procedure, the printing ink, the deposited metal, P
Top coat processing of each VDC resin is applied to the film,
Table 2 shows the results of measuring the lamination strength.

Comparative Example 4 An aqueous resin compounding liquid and a primer coated film were obtained in the same procedure as in Comparative Example 3, except that the aqueous polyurethane resin (PU) was changed to an aqueous polyester resin (PEs).
The mixing operation of the amino resin (AR-1) was difficult as in Comparative Example 3. Table 2 shows the results of evaluating the blended liquid and the results of measuring the lamination strength of the film.

Comparative Examples 5 to 11 An aqueous resin compounding liquid and a primer coat film were obtained in the same procedure as in Example 1 except that the mixing ratio was changed to the resin components shown in Table 2. As a result of evaluating the aqueous resin formulation,
Table 2 shows the results of measuring the lamination strength of the film.

[0045]

[Table 2]

[0046]

According to the present invention, an easily-adhesive plastic capable of maintaining high adhesive activity even after hot water treatment with respect to a top coat layer including a printing ink, a vapor-deposited metal, and a gas barrier resin. A film can be provided. The easily adhesive polyester film of the present invention is extremely useful in various applications such as general industrial films such as electric / electronic parts, building materials, photoengraving, adhesive tapes, mold release, and food packaging films. The use of is also advantageous in that workability is improved in processing steps such as coating, printing, vapor deposition, and lamination.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int. Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09D 5/00 C09D 5/00 Z 161/20 161/20 167/00 167/00 175/00 175/00 // B29K 61:20 B29K 61:20 67:00 67:00 75:00 75:00 B29L 9:00 B29L 9:00 F term (reference) 4F100 AH02B AK35B AK41A AK41B AK51B AT00A BA02 CA30B EH462 EJ372 EJ412 GB07 GB23 GB41 GB90 JB09B JB11B JL11B JM01B YY00B 4F210 AA24 AA31 AA38 AB01 AB19 AG01 AG03 QA02 QA03 QC06 QG01 QG15 QG18 QW05 4J038 DA141 DA161 DA171 DD061 DD081 DD241 DF022 DF042 DG0512 DG111 DG111 DG111 DG121 DG121

Claims (6)

[Claims] Claims: At least one surface of a substrate film
(A) a water-soluble or water-dispersible resin, (B) a substantially water-insoluble amino resin, and (C) an easy-adhesion layer composed of a water-dispersing aid, and the composition ratio of each component forming the easy-adhesion layer. But,
The mass ratio of component (A) to component (B) is 98/2 to 70/3
0 and the mass ratio of component (B) to component (C) is 80
/ 20 to 50/50, an easily adhesive plastic film. 2. The easily adhesive plastic film according to claim 1, wherein the water-soluble or water-dispersible resin is at least one of a polyurethane resin and a polyester resin. 3. The easily adhesive plastic film according to claim 1, wherein the water dispersing aid is an acetylene glycol compound or a polyethylene oxide adduct thereof. 4. The easily adhesive plastic film according to claim 1, wherein the base film is a polyester film. 5. After mixing (B) a substantially water-insoluble amino resin and (C) a water-dispersing aid, the mixed solution is mixed with (A)
An aqueous solution or an aqueous dispersion prepared by mixing a water-soluble or water-dispersible resin and diluting with water is applied to a base film and heat-treated, wherein the adhesive is easily adhered to any one of claims 1 to 4. Method for producing functional plastic film. 6. The method according to claim 5, wherein the aqueous solution or the aqueous dispersion is applied to the base film before the completion of the biaxial orientation crystallization, dried, stretched in at least one direction, and then heat-treated. Manufacturing method of adhesive plastic film.